Smoking Article Filter with Glycerin Aerosol Former and Restrictor
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Solution Overview
Problem
Highly ventilated cigarettes face issues with low resistance to draw (RTD) while attempting to reduce particulate and gas phase constituents of mainstream smoke, with existing solutions either worsening CO to tar ratios or increasing phenol and cresol levels per unit tar.
Innovation Solution
Incorporating a tobacco rod with a high glycerin content and a filter design featuring a restrictor and ventilation zones, which vaporizes glycerin to dilute smoke constituents and maintain desired ventilation levels, along with a reconstituted tobacco sheet and specific filter segment configurations to manage resistance and smoke composition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If high levels of ventilation are used to reduce particulate and gas phase constituents, then smoke constituent levels are reduced, but resistance to draw becomes unacceptably low
Solution Approach 1:
The filter is divided into multiple segments with different functions: a first filter segment for initial filtration, a restrictor segment to control airflow and maintain RTD, and a second filter segment for additional filtration. This segmentation allows each segment to be optimized for its specific function, resolving the contradiction between ventilation and resistance to draw.
Solution Approach 2:
Different portions of the filter have different properties: the restrictor segment has specific flow resistance characteristics, while the filter segments have different densities and filtration efficiencies. The ventilation holes are strategically positioned in specific regions. This local differentiation allows the filter to simultaneously achieve high ventilation and maintain acceptable RTD.
2Force
If high density cellulose acetate filter segments are used to increase resistance to draw, then RTD is improved, but tar delivery is reduced with little effect on gas phase components
Solution Approach 1:
The filter uses composite construction combining cellulose acetate segments with a restrictor segment made of different material properties. This composite approach allows the restrictor to provide flow resistance while the cellulose acetate segments provide filtration, achieving both improved RTD and maintained tar delivery.
Solution Approach 2:
The filter is segmented into distinct functional zones: filtration segments for tar removal and a restrictor segment for flow control. This segmentation prevents the restrictor from unnecessarily reducing tar delivery while still maintaining gas phase constituent reduction through the ventilation holes.
3Object-affected harmful factors
If ventilation holes are positioned upstream of the restrictor, then ventilation effectiveness is improved, but resistance to draw becomes even lower
Solution Approach 1:
The ventilation holes are positioned in specific locations relative to the restrictor and filter segments, creating localized ventilation zones that optimize both gas phase constituent reduction and flow resistance characteristics.
Solution Approach 2:
The filter design incorporates ventilation holes at multiple positions along the axial dimension, with different numbers and distributions of holes in different sections. This dimensional approach allows optimization of ventilation effectiveness while maintaining RTD through the restrictor.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution achieves improved CO to tar ratios and reduced phenol and cresol levels, maintaining high ventilation and resistance to draw throughout the smoking process, comparable to or better than cigarettes with activated carbon filters without the taste penalty.
Implementation Method 1
During a puff on a smoking article incorporating a restrictor in the filter and an aerosol former such as glycerin in the tobacco rod, such glycerin vaporizes, introducing glycerin and water into the mainstream tobacco smoke and diluting particulate phase constituents present in the smoke
Implementation Method 2
highly ventilated cigarettes however have drawbacks in RTD as previously discussed
Data Source
AI summary
Provided is a smoking article including a smokeable filler with a high aerosol former content and a filter. Preferably, the smokeable filler includes about 4 wt % glycerin to about 35 wt % glycerin. The filter includes a cylindrical tube attached to the tobacco rod with tipping paper, a first filter segment at a location along said cylindrical tube adjacent and in a downstream relation to said tobacco rod, and a flow restricting filter segment at a location adjacent and in a downstream relation to the first filter segment. In an embodiment, the filter also includes a cavity adjacent and in a downstream relation to the flow restricting filter segment, and a ventilation zone at a location along the cavity including perforations that extend through the tipping paper and the cylindrical tube. Preferably, the ventilation zone is in a downstream relation to the flow restricting filter segment.